Preprocessor system and method for rejection of duplicate invoices

ABSTRACT

An accounts payable system in which invoices submitted by electronic data interchange (EDI) foe audited for duplicate invoices prior to them being entered into the production database, or environment. Pre-processor logic audits, identifies and returns electronically duplicate transmissions. At this pre-processor level, all inbound invoices are sorted in credit/debit sequence. Invoices are posted (committed to the production accounts payable environment; that is, to the accounts payable data base) one at a time so purchase order history is current for each evaluation. Inbound invoices are sorted by credit/debit. Only debits are audited.

BACKGROUND OF THE INVENTION

[0001] 1. Technical Field of the Invention

[0002] This invention pertains to an account payable system. More particularly, it relates to an account payable system in which duplicate invoices are identified during preprocessing, thus preventing introduction of duplicate invoices into the accounts payable data base and substantially avoiding manual processing.

[0003] 2. Background Art

[0004] Trading partners (also referred to as vendors) submitting invoices to a SAP (accounts payable) installation often send in duplicate files, causing the accounts payable center a great deal of analysis and time to manually delete these duplicates from the production system (also referred to as the accounts payable data base).

[0005] Consequently, there is a need in the art for a system and method for avoiding much, if not all, such manual processing.

[0006] It is an object of the invention to provide an improved accounts payable system and method.

[0007] It is a further object of the invention to provide an improved accounts payable system and method in which manual deletion of duplicate files is substantially eliminated.

[0008] It is a further object of the invention to provide an improved accounts payable system and method in which duplicate invoices (input files) are identified during preprocessing to avoid introduction of duplicate invoices into the accounts payable database.

SUMMARY OF THE INVENTION

[0009] In accordance with the invention, there is provided an accounts payable system and method. Electronic invoices received from a vendor are preprocessed to identify duplicate invoices. Invoices not identified as duplicate invoices are introduced into an accounts payable data base for payment while invoices identified as duplicate invoices are rejected back to the vendor without being introduced into the accounts payable data base for payment.

[0010] Other features and advantages of this invention will become apparent from the following detailed description of the presently preferred embodiment of the invention, taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011]FIG. 1 illustrates a flow diagram of the method of the invention.

[0012]FIG. 2 illustrates a flow diagram of the audit invoices step of FIG. 1.

[0013]FIGS. 3A and 3B, arranged as shown in FIG. 3, illustrate a flow diagram of the system of the invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Acronyms; Abbreviations; Function, Procedure and Variable Names and Definitions (Most of these abbreviations are not intuitive in English inasmuch as they were derived from German language phrases. The code in Table 1 is written in the syntax of the ABAP/4 language, and has a syntax similar to that of SQL or the IBM DB/2 relational database language.) AMT Amount. BSAK Cleared invoices. BELNR SAP document number. BELNR-LOW | These three variable names are used to BELNR-SIGN | fetch a list of documents from the BELNR-OPTION | purchase order history, a table of invoices that have the same vendor invoice number. BSIK Open invoices. CHECK An ABAP/4 verb which checks a condition as true or false; if true, processing continues through the current event (such as a subroutine); if false, processing returns to the place from which this event was called, such as from a PERFORM. CLEAR An ABAP/4 verb which initializes a variable or data stream to zeros or blanks, etc., depending upon the data type. DESCRIBE An ABAP/4 verb that means to describe the attributes of data. In the context of this invention (See Table 1, lines 66, 74, 81), the data is a table and the desired attribute is the number of rows in the table. DOCNUM Location (memory or register) where the IDOC number is stored. DUP Duplicate. EBELN Purchase order number. EBELP Purchase order item (position on purchase order). EDI Electronic Data Interchange. EDIDC IDOC control table. EDIDD IDOC data segment table. EDT_Z51 An internal table used to hold purchase order items. EKBE Purchase order history table. EKBE_ITAB An internal table used to hold purchase order history for one purchase order. EKBE_ITAB-DMBTR Invoice amount in the purchase order history table. EXIT An ABAP/4 verb which causes control to return unconditionally to the caller from this subroutine or other event. E1EDP02 Structure (a list of field names) of the IDOC purchase order item data segment. The IDOC is stored in a table in which each row has two parts: control information, and data segment. IDOC Intermediate document. An invoice is a kind of IDOC; In FIG. 3, there exist 824 IDOCs 138 and invoice IDOCs 152. IDOC_CONTAINER An internal table containing all IDOC data segments. IDOC_CONTROL Holding area (register or field) for IDOC control record. IDOC_PO Holding area (register or field) for purchase order number. IDOC_PO-EBELN Another holding area for purchase order number. IDOC_PO-EBELP Holding area for purchase order item number. INT_ZPPOL A temporary, internal table resident in memory for the ZPPOL table. ITAB Used in a table name to designate an internal table corresponding to a SAP physical table. An internal table is a location resident in main memory which is initialized to empty. LIFNR Vendor number. MESSAGE S070 An ABAP/4 message verb meaning get message #70, a message which identifies a duplicate invoice exception. PO Purchase Order PO_HISTORY_AMT Net amount of credit/debit invoices for a vendor invoice number, purchase order item number combination. QUALF Field in memory that contains the qualifier value of an IDOC data segment. REFRESH An ABAP/4 verb: deletes all rows in an internal table. SAP System Application and Products for Data Processing (an English language phrase roughly equivalent to the German language phrase from which the acronym is derived). SDATA Field that contains the IDOC data segment application data. SEGNAM Segment name: a field that contains the value that identifies the data structure in an IDOC data segment. SELECT An ABAP/4 verb: get rows out of table. SHKZG Debit/credit indicator. SNDPRN Vendor number on IDOC control record. SY Structure name that contains system values available to the program. SY-DBCNT Data base count field; used to count number of rows returned from a SELECT from table, or to hold the value of the number of rows in an internal table. SY-SUBRC Return code (successful or unsuccessful) from a call (SELECT, SEARCH, etc.) VBELN Vendor's invoice number in ZPPAL table 136 (FIG. 3A) WF00 SAP transaction for processing workflow processes 162 (FIG. 3B). XBLNR Vendor's invoice number in SAP financial documents. X.12 ANSI standard: communications protocol for EDI messages. ZEILE Purchase order item number field in the IDOC data segment. ZEKKN Accounting serial number in purchase order history table EKBE, one of tables 134 (FIG. 3A). ZIPRO The processing status field in audit log table ZPPOL 142 (FIG. 3B). Values include “D” (duplicate), “P” (processed) and “E” (error). ZLGNO Preprocessor 130 log number; associated with a given file or run number. ZPPAL Exception log table 136 (FIG. 3A). ZPPOL Audit log table 142 for auditing results of IDOC processing (the D, P, E entries, supra). ZSQNO Log sequence number 810 IDOC file X.12 message identifier for an invoice or billing document. 824 Rejection Application advice derived from an application program, such as preprocessor 130 or post 150. 997 Rejection Translator 114 rejection, meaning this X.12 message received from vendor is no good. “—” The “—” is typically used as a separator between table name and field name, as in: tablename-fieldname and in this respect uses a DB2 or SQL-like syntax. It can also be used instead of an underscore “—” in a variable name.

[0015] In accordance with the preferred embodiment of the invention, an account payable system is provided in which duplicate invoices are identified during preprocessing, thus preventing introduction of duplicate invoices into the accounts payable data base and substantially avoiding manual processing.

[0016] In accordance with the preferred embodiment of the invention, invoices submitted such as by electronic data interchange (EDI) to a SAP (accounts payable) installation are audited for duplicate electronic invoices prior to them being entered into the production SAP environment. This is accomplished by building the logic at the pre-processor level to audit, identify and return electronically duplicate transmissions. At the pre-processor level, all inbound invoices are sorted in credit/debit sequence. Invoices are posted (committed to the production SAP environment; that is, to the accounts payable data base) one at a time so purchase order history is current for each evaluation. Inbound invoices are sorted by credit/debit. Only debits are audited for duplicates.

[0017] Referring to FIG. 1, in accordance with the method of the invention, invoices are added to an accounts payable data base in such a manner as to avoid introducing spurious data to the data base. (1) In step 80, an inbound EDI invoice file is grabbed before it is input to the data base. (2) In step, 82, invoices are audited for duplicates. (3) In step 84, upon determining a duplicate invoice, a transaction back to the vendor is created. And (4) in step 86, posting to the accounts payable data base is done only for invoices determined during auditing not to be duplicates.

[0018] Referring to FIG. 2, the auditing step 82 includes, in step 88, sorting the inbound invoices against SAP production tables for same vendor and same vendor invoice number; in step 90, sorting hits from step 88 for same purchase order billed; in step 92, sorting hits from step 90 for same items billed on purchase order; and in step 94 sorting hits from step 92 to see if any item identified has a net sum>0. If an item has net sum≦0, it is not a duplicate and is allowed in steps 98 and 86 to be posted to the accounts payable data base. If an item has net sum>0, it is a duplicate, and a transaction back to the vendor is created in steps 96 and 84 to cancel the duplicate invoice.

[0019] Referring to FIG. 3, vendor system 110 is connected over lines 201 (for submission of an 810 EDI invoice) and 203 (for receipt of messages back) to EDI mailbox 112. EDI mailbox 112 transmits invoice data to DI translator 114 over interface 205. Translator 114 is connected to production interface 122 and 810 IDOC files 124 as is represented by lines 213 and 211, respectively; receives 824 rejections 120 from 810 exception reports block 138 over lines 255 and 257; and communicates X.12 824 rejections 118 to vendor 110 over lines 259 and 261. Preprocessor 130 is connected to production interface 122 and 810 IDOC files 124 as is represented by lines 217 and 215, respectively. Preprocessor 130 receives data from SAP purchase order and other tables 134 over interface 225; and provides data identifying duplicate invoices over line 249 to exception log tables ZPPAL 136 and over line 221 to audit log ZPPOL 142. Preprocessor 130 creates the SAP IDOC and provides output for purchase orders which are not duplicates over interface 219 to post SAP invoice/credit block 150 and over interface 223 to IDOC table 152. Post block 150 provides output over line 229 to SAP PO invoice verification file 154. Post block 150 provides a processed ‘P’ message to audit log ZPPOL 142 over line 269 for invoices for which no error has been identified; and an error ‘E’ message over line 267 for invoices which are not posted due to some processing error. Invoices which are not posted due to some processing error are communicated over line 231 to SAP workflow file 156, and, as is represented by block 162 and lines 237 and 239, these exceptions are manually worked using SAP WF00. Audit control reports 146 are communicated over lines 241 and 243 to print block 148. Old information archive data 144 is communicated over lines 245 and 247 from audit log 142 to exception log tables 247. As is represented by line 251, exceptions and warnings reports 138 are communicated from exception log tables 136 to print block 140 over line 253 or as 824 rejections 120 over lines 255 and 257 to translator 114.

[0020] In operation, checkpoints CP0 through CP7 (represented generally by the numbered triangles in FIG. 3), control the EDI process of the preferred embodiment of the invention.

[0021] Checkpoint 0: DI set-up and authorization. A vendor 110 who submits and 810 EDI invoice over line 210 to EDI mailbox must be set-up as a trading partner in DI translator 114. In accordance with the preferred embodiment of the invention, a restrictive mailbox 112 is used, and if the account user identifier (ID) is not set-up, the network sends an X.12 997 rejection 116 back to vendor 110 stating that its 810 invoice was undeliverable.

[0022] Checkpoint 1: DI translator in/out. A count is maintained of the number of invoices coming into DI translator 114 over line 205, and it must equal the number of invoices that exit DI translator as accepted invoices over line 213 or as rejected invoice records over lines 207 and 259. The dollar count coming into DI translator 114 over interface 205 is taken from the TDS segment of the incoming record.

[0023] Checkpoint 2: Pre-processor in/out. Preprocessor 130 completes and validates transactions passed through production interface 122 from DI translator 114. Preprocessor 130 generates audit control log 142 and report 146; preprocessor errors, or exception reports 138 and log 136; calculates line item accounts; deducts sales tax; adds multiple IDOCs to IDOC table 152; and creates the SAP IDOC number.

[0024] Checkpoint 3: Post, or create, SAP invoice/credit. Post SAP invoice/credit block ensures that the record and dollar count that exited from DI translator 114 match what is entered into SAP 156.

[0025] Checkpoint 4: SAP error queue for exceptions. Exceptions going into an error queue in workflow file 156 are IDOCs that fail SAP audits, such as configuration problems. Workflow file 156 contains exception messages for failed IDOCs that are handled via workflow processes. That is, when an IDOC fails it is put in a work queue. A workflow process is a job that controls what will happen with that failed IDOC. In this case, the failed IDOC message is placed in a queue and a corresponding workflow task is sent to an SAP user id. The recipient at that user ID retrieves these messages from his mail inbox as is represented by line 237 and handles them one at a time, accessing IDOC table 152 as is represented by line 263 and SAP Wf00 block 162 to again process the IDOC and determine why the IDOC failed (see what error messages they get.)

[0026] Checkpoint 5: Pre-processor exceptions/warnings. Exceptions added to log tables 136 are IDOCs which become errors (representing duplicate invoices) as a result of the audit by preprocessor 130. Warnings added to log tables 136 represent IDOCs where preprocessor 130 recalculates an invoice, deducts sales tax, or adds multiple IDOCs. A report 140 is generated showing rejection transactions, where preprocessor 130 errors successfully resulted in an 824 rejection message 118, 120 being sent to vendor 110.

[0027] Checkpoint 6: Archive old information. Exception log tables 136 and audit log tables 142 are archived to block 144 at predefined intervals. A report shows the range of dates that are archived, and the date of archival.

[0028] Checkpoint 7: Production/Procurement interface. Production interface 122, in this preferred embodiment of the invention, interfaces the MVS environment (above interface 122) to the AIX environment (below interface 122).

[0029] Referring to Table 1, the processing which occurs in preprocessor 130 is described in further detail. The code is in the syntax of the ABAP/4 language, which has a syntax similar to that of the SQL language.

[0030] In Table 1, lines 1-13 are the main routine for processing IDOCs that are created and for calling the duplicate invoice check routine. The flag at line 8 indicates whether or not a duplicate invoice has been found. At line 9, if this invoice is a debit invoice, then the duplicate invoice check starting at line 16 is called. Upon returning from the duplicate invoice check, processing drops down to line 13 where the duplicate invoice flag is checked and, if the flag indicates the invoice is ok, processing leaves the code of Table 1 and picks up in code (not shown) executed within post block 150 (FIG. 3B). (If the duplicate invoice check at line 13 shows duplicate ‘D’ status, then the duplicate check routine below line 14 will have already posted the error and sent the error message back to the vendor.) Refer to the schedule of abbreviations, supra, for a description of each data and variable name.

[0031] In Table 1, lines 16 to 125 are the duplicate invoice check routine executed within preprocessor 130. In this routine, CHECK verbs are executed at lines 23, 67, 75, 82 and 89, representing the five checks comprising duplicate invoice checking in accordance with the preferred embodiment of the invention. In the logic of this embodiment of the invention, if any CHECK fails, then the invoice is not a duplicate, and execution returns to main routine at lines 1-14.

[0032] In Table 1, lines 15-23, the return code from exception log table ZPPAL 136 is tested. The CHECK at line 23 checks the return code, which is never expected to fail, and processing continues to line 27.

[0033] In Table 1, lines 24-67, all open and closed invoices for this vendor's invoice number are selected (see lines 45 and 56). If none are found, no checking is to be done, and the CHECK at line 67 will return control to the main routine. At line 27 this vendor is checked to see if it is identified as one for which duplicate invoice checking is to be performed.

[0034] In Table 1, lines 68-75, the list of vendor invoice numbers determined previously to match the one we are checking is examined to see if there has been any previous related purchase orders. That is, is there a PO history. If there is none, then an exit from the duplicate invoice check subroutine occurs at the CHECK at line 75.

[0035] In Table 1, lines 76-82, determines if any purchase order item IDOC data segments have been identified. The CHECK at line determines if any purchase order item IDOC data segments have been identified. The result is always expected to be true, and processing continues.

[0036] In Table 1, lines 83-89, the final check is performed. This routine determines, for each item on the invoice, the sum of its purchase order history (having the same vendor's invoice number as the one being checked). If an item has a purchase order history greater than zero, the CHECK at line 89 rejects this purchase order as a duplicate.

[0037] In Table 1, lines 91 to 125, the result of duplicate invoice checking is logged to ZPPOL log 142 and ZPPAL log 136, and status is logged to IDOC table 152.

[0038] In Table 1, lines 127 to 193, several subroutines called by PERFORM verbs from the duplicate invoice checking process are set forth. FORM BUILD_EKBE_ITAB_TABLE, at lines 127-137, is the subroutine called by the PERFORM at line 73 that obtains the purchase order history for invoices that have a vendor invoice number equal to the invoice number being checked. FORM BUILD_IDOC_PO_TABLE, at lines 138 to 175, is the subroutine called by the PERFORM at lin 80 that reads in IDOC segments and gets every unique purchase order/item number combination, and generates the list of purchase order items of interest. FORM TEST_PO_HIST_WITH_PO_ITEMS, at lines 176 to 193, is the subroutine called by the PERFORM at line 88 that sums the net purchase order history amount for every purchase order item on the invoice being checked; if it finds an item with an amount greater than zero, the routine exits back to the PERFORM (line 88) and quits checking. TABLE 1 DEBIT INVOICES DUPLICATE CHECKING  1 *  2 * Debit invoices duplicate checking  3 *  4 DATA:DUP_INVOICE(1).  5 *  6 * Contained in form process-zppol (Table 142, FIG. 3B)  7 *  8 DUP_INVOICE = SPACE.  9 IF INT-ZPPOL-CREDIT_DEBIT = ‘D’.  10 PERFORM DUP_INVOICE_CHECK.  11 CLEAR ZPPAL.  12 ENDIF.  13 CHECK DUP_INVOICE=SPACE.  14 *  15 *  16 FORM DUP_INVOICE_CHECK.  17 *  18 * Break-point  19 *  20 SELECT SINGLE* FROM ZPPAL WHERE  21 ZLGNO = INT_ZPPOL-ZLGNO AND  22 ZSQNO = INT-ZPPOL-ZSQNO.  23 CHECK SY-SUBRC=00.  24 *  25 * Is the vendor to be dup invoice checked?  26 *  27 IF ZPPAL-SNDPRN IN SNDPRN.  28 *  29 * Next sentence  30 *  31 ELSE.  32 EXIT.  33 ENDIF.  34 *  35 * Get all invoice numbers with same vendor  36 * invoice number to be used later for  37 * summing po-history by vendor invoice number.  38 *  39 * Check open documents  40 *  41 CLEAR BELNR.  42 REFRESH BELNR.  43 *  44 *  45 SELECT* FROM BSIK WHERE  46 LIFNR = ZPPAL-SNDPRN AND  47 XBLNR = ZPPAL-VBELN(16).  48 BELNR-LOW = BSIK-BELNR.  49 BELNR-SIGN = ‘1’.  50 BELNR-OPTION = ‘EQ’.  51 APPEND BELNR.  52 ENDSELECT.  53 *  54 * Check closed documents.  55 *  56 SELECT* FROM BSAK WHERE  57 LIFNR = ZPPAL-SNDPRN AND  58 XBLNR = ZPPAL-VBELN(16).  59 BELNR-LOW = BSAK-BELNR.  60 BELNR-SIGN = ‘1’.  61 BELNR-OPTION = ‘EQ’.  62 APPEND BELNR.  63 ENDSELECT.  64 *  65 *  66 DESCRIBE TABLE BELNR LINES SY-DBCNT.  67 CHECK SY-DBCNT>0.  68 *  69 * Does any PO history exist for the  70 * PO on the idoc with invoices in the  71 * above BELNR ranges table?  72 *  73 PERFORM BUILD_EKBE_ITAB_TABLE.  74 DESCRIBE TABLE EKBE_ITAB LINES SY-DBCNT.  75 CHECK SY-DBCNT>0.  76 *  77 * Fetch PO-item list from the idoc.  78 *  79 INTERMEDIATE_DOCUMENT_NUMBER = INT_ZPPOL-DOCNUM.  80 PERFORM BUILD IDOC_PO_TABLE.  81 DESCRIBE TABLE IDOC_PO LINES SY-DBCNT.  82 CHECK SY-DBCNT>0.  83 *  84 * Does at least one PO-Item on the idoc  85 * have a net PO history > zero?  86 *  87 CLEAR PO_HISTORY_AMT.  88 PERFORM TEST_PO_HIST_WITH_PO_ITEMS.  89 CHECK PO_HISTORY_AMT>0.  90 *  91 * If all the above tests were true then the  92 * invoice is a duplicate.  93 *  94 MESSAGE S070 WITH ZPPAL-VBELN(16) IDOC_POK-EBELN.  95 SKIP.  96 WRITE:/‘Dup Invoice:’,  97 ‘idoc’    ,INT_ZPPOL-DOCNUM,  98 ‘PO-Item’  ,IDOC_PO-EBELN,IDOC_PO-EBELP,  99 ‘Hist-Amt’ ,PO_HISTORY_AMT, 100 ‘’. 101 WRITE:/‘  Vendor’, ZPPAL-SNDPRN, 102 ‘Vendor-InvNo’, ZPPAL-VBELN, 103 ‘’. 104 PERFORM FORMAT-MESSAGE 105 USING 070 ‘|’ ZPPAL-VBELN(16) 106 IDOC_PO-EBELN    ‘’‘’. 107 UPDATE ZPPAL. 108 ZPPOL-ZIPRO = ‘D’. 109 UPDATE ZPPOL. 110 PERFORM STATUS_DUP_INVOICE.   “Update idoc status 111 COMMIT WORK. 112 CALL FUNCTION ‘EDI_DOCUMENT_CLOSE_PROCESS’ 113 EXPORTING 114 DOCUMENT NUMBER = INTERMEDIATE_DOCUMENT_NUMBER 115 IMPORTING 116 IDOC_CONTROL = EDIDC 117 EXCEPTIONS 118 DOCUMENT_NOT_OPEN = 01 119 FAILURE_IN_DB_WRITE = 02 120 PARAMETER_ERROR = 03 121 STATUS_SET_MISSING = 04. 122 CLEAR ZPPAL. 123 CLEAR ZPPOL. 124 DUP_INVOICE = ‘X’. 125 ENDFORM.” DUP_INVOICE_CHECK. 126 *EJECT 127 FORM BUILD_EKBE_ITAB_TABLE. 128 CLEAR EKBE_ITAB. 129 REFRESH EKBE_ITAB. 130 SELECT *FROM EKBE INTO TABLE EKBE_ITAB WHERE 131 EBELN = INT_ZPPOL-EBELN AND 132 ZEKKN > 0 AND 133 BELNR IN BELNR. 134 SORT EKBE_ITAB BY EBELN EBELP. 135 ENDFORM.” BUILD_EKBE_ITAB_TABLE. 136 * 137 * 138 FORM BUILD_IDOC_PO_TABLE. 139 CALL FUNCTION ‘EDI_DOCUMENT_OPEN_FOR_PROCESS’ 140 EXPORTING 141 DOCUMENT_NUMBER = INTERMEDIATE_DOCUMENT_NUMBER 142 IMPORTING 143 IDOC_CONTROL = EDIDC 144 EXCEPTIONS 145 DOCUMENT_FOREIGN_LOCK = 01 146 DOCUMENT_NOT_EXIST = 02 147 DOCUMENT_NUMBER_INVALID = 03. 148 CHECK SY-SUBRC = 00. 149 CLEAR IPOC_PO. 150 REFRESH IDOC_PO. 151 DO. 152 CALL FUNCTION ‘DIC_SEGMENT_GET_NEXT’ 153 EXPORTING 154 DOCUMENT_NUMBER = INTERMEDIATE_DOCUMENT_NUMBER 155 IMPORTING 156 IDOC_CONTAINER = EDIDD 157 EXCEPTIONS 158 DOCUMENT_NUMBER_INVALID = 01 159 END_OF_DOCUMENT = 02. 160 IF SY-SUBRC <> 00. EXIT.ENDIF.“at end exit do loop 161 *** if edidd-segnam = ‘EDI_Z51’. 162 *** move z51_rec-ordnr to idoc_po_ebeln. 163 *** move z51_rec-orpnr to idoc po-ebelp. 164 IF EDIDD-SEGNAM = ‘E1EDP02’. 165 MOVE EDIDD-SDATA   TO E1EDP02. 166 IF E1EDP02-QUALF = ‘001’. 167 MOVE E1EDP02-BELNR TO IDOC_PO-EBELN. 168 MOVE E1EDP02-ZEILE TO IDOC_PO-EBELP. 169 APPEND IDOC_PO. 170 ENDIF. 171 ENDIF. 172 ENDDO. 173 SORT IDOC_PO BY EBELN EBELP. 174 ENDFORM.” BUILD_IDOC_PO_TABLE. 175 *----------------------------------------------------------* 176 FORM TEST_PO_HIST_WITH_PO_ITEMS. 177 LOOP AT IDOC_PO. 178 CLEAR PO_HISTORY_AMT. 179 LOOP AT EKBE_ITAB WHERE 180 EBELP = IDOC_PO-EBELP. 181 IF EKBE_ITAB-SHKZG _ ‘H’. 182 PO_HISTORY_AMT = 183 PO_HISTORY_AMT + (EKBE_ITAB_DMBTR*−1). 184 ELSE. 185 PO_HISTORY_AMT = 186 PO_HISTORY_AMT + EKBE_ITAB_DMBTR. 187 ENDIF. 188 ENDLOOP. “AT EKBE_ITAB WHERE 189 IF PO_HISTORY_AMT>0. 190 EXIT. 191 ENDIF. 192 ENDLOOP.” IDOC_PO. 193 ENDFORM.” TEST_PO_HIST_WITH_PO_ITEMS.

Advantages over the Prior Art

[0039] It is an advantage of the invention that there is provided an improved accounts payable system and method.

[0040] It is an advantage of the invention that there is provided an improved accounts payable system and method in which manual deletion of duplicate files is substantially eliminated.

[0041] It is an advantage of the invention that there is provided an improved accounts payable system and method in which duplicate invoices (input files) are identified during preprocessing to avoid introduction of duplicate invoices into the accounts payable database.

Alternative Embodiments

[0042] It will be appreciated that, although specific embodiments of the invention have been described herein for purposes of illustration, various modifications may be made without departing from the spirit and scope of the invention. In particular, it is within the scope of the invention to provide a memory device, such as a transmission medium, magnetic or optical tape or disc, or the like, for storing signals for controlling the operation of a computer according to the method of the invention and/or to structure its components in accordance with the system of the invention.

[0043] Accordingly, the scope of protection of this invention is limited only by the following claims and their equivalents. 

1. Method for operating an account payable computing system, comprising the steps of: preprocessing electronic invoices received from a vendor to identify duplicate invoices; introducing invoices not identified as duplicate invoices into an accounts payable data base; and rejecting invoices identified as duplicate invoices back to said vendor without introducing said duplicate invoices into said accounts payable data base.
 2. A method for operating a computing system, comprising the steps of: grabbing an inbound EDI invoice file from a vendor before it is input to an accounts payable database; auditing said inbound EDI invoice file for a duplicate invoice item; upon determining said inbound EDI invoice is a duplicate, creating a duplicate invoice transaction back to said vendor; and posting to said accounts payable database only those invoices determined not to be duplicates.
 3. The method of claim 2 , said auditing step comprising the further steps of: first sorting said inbound EDI invoice against an accounts payable production table for same vendor and same vendor invoice number; second sorting hits from said first sorting for same purchase order billed; third sorting hits from said second sorting for same items billed on purchase order; fourth sorting hits from said third sorting to identify said inbound EDI invoice as a duplicate invoice if it contains an item having a net sum greater than zero.
 4. Method for operating a computing system responsive to receipt of an electronic input invoice from a vendor, comprising the steps of: grabbing said input invoice before it is input to an accounts payable database; identifying previously received invoices from said vendor having the same vendor invoice identifier; identifying said previously received invoices having the same vendor invoice identifier any items corresponding to items on said input invoice; calculating the net sum of items on said input invoice having corresponding items on said previously received invoices; for an input invoice having an item with a net sum greater than zero, communicating a duplicate invoice rejection message back to said vendor; and for an input invoice having no item with a net sum greater than zero, posting said input invoice to said accounts payable database.
 5. A program storage device readable by a machine, tangibly embodying a program of instructions executable by a machine to perform method steps for processing electronic input invoices from a vendor, said method steps comprising: preprocessing said input invoices to identify duplicate invoices; introducing invoices not identified as duplicate invoices into an accounts payable data base for payment; and rejecting invoices identified as duplicate invoices back to said vendor without introducing said duplicate invoices into said accounts payable data base for payment.
 6. A program storage device readable by a machine, tangibly embodying a program of instructions executable by a machine to perform method steps for operating a computing system responsive to receipt of an electronic input invoice from a vendor, said method steps comprising: grabbing said input invoice before it is input to an accounts payable database; identifying previously received invoices from said vendor having the same vendor invoice identifier; identifying said previously received invoices having the same vendor invoice identifier any items corresponding to items on said input invoice; calculating the net sum of items on said input invoice having corresponding items on said previously received invoices; for an input invoice having an item with a net sum greater than zero, communicating a duplicate invoice rejection message back to said vendor; and for an input invoice having no item with a net sum greater than zero, posting said input invoice to said accounts payable database.
 7. An article of manufacture comprising: a computer useable medium having computer readable program code means embodied therein for operating a computing system responsive to receipt of an electronic input invoice from a vendor, the computer readable program means in said article of manufacture comprising: computer readable program code means for causing a computer to effect grabbing said input invoice before it is input to an accounts payable database; computer readable program code means for causing a computer to effect identifying previously received invoices from said vendor having the same vendor invoice identifier; computer readable program code means for causing a computer to effect identifying said previously received invoices having the same vendor invoice identifier any items corresponding to items on said input invoice; computer readable program code means for causing a computer to effect calculating the net sum of items on said input invoice having corresponding items on said previously received invoices; computer readable program code means for causing a computer to effect for an input invoice having an item with a net sum greater than zero, communicating a duplicate invoice rejection message back to said vendor; and computer readable program code means for causing a computer to effect for an input invoice having no item with a net sum greater than zero, posting said input invoice to said accounts payable database.
 8. An article of manufacture comprising: a computer useable medium having computer readable program code means embodied therein for processing electronic input invoices from a vendor, the computer readable program means in said article of manufacture comprising: computer readable program code means for causing a computer to effect preprocessing said input invoices to identify duplicate invoices; computer readable program code means for causing a computer to effect introducing invoices not identified as duplicate invoices into an accounts payable data base for payment; and computer readable program code means for causing a computer to effect rejecting invoices identified as duplicate invoices back to said vendor without introducing said duplicate invoices into said accounts payable data base for payment.
 9. A computing system responsive to receipt of an electronic input invoice from a vendor, comprising: means for grabbing said input invoice before it is input to an accounts payable database; means for identifying previously received invoices from said vendor having the same vendor invoice identifier; means for identifying said previously received invoices having the same vendor invoice identifier any items corresponding to items on said input invoice; means for calculating the net sum of items on said input invoice having corresponding items on said previously received invoices; means, responsive to an input invoice having an item with a net sum greater than zero, for communicating a duplicate invoice rejection message back to said vendor; and means, responsive to an input invoice having no item with a net sum greater than zero, for posting said input invoice to said accounts payable database. 